Evtukhov, V. M., and A. M. Klopot. “Asymptotic Representations for Some Classes of Solutions of Ordinary Differential Equations of Order $n$ With Regularly Varying Nonlinearities”. Ukrains’kyi Matematychnyi Zhurnal 65, no. 3 (March 25, 2013): 354-380. Accessed March 29, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2424.